docs: add query parameters for new files

docs/content/doc/developers/integrations.en-us.md

@@ -24,3 +24,22 @@ If you are looking for [CI/CD](https://gitea.com/gitea/awesome-gitea#user-conten
 an [SDK](https://gitea.com/gitea/awesome-gitea#user-content-sdk),
 or even some extra [themes](https://gitea.com/gitea/awesome-gitea#user-content-themes),
 you can find them listed in the [awesome-gitea](https://gitea.com/gitea/awesome-gitea) repository!
+
+## Pre-Fill New File name and contents
+
+If you'd like to open a new file with a given name and contents,
+you can do so with query parameters:
+
+```txt
+GET /{{org}}/{{repo}}/_new/{{filepath}}
+    ?filename={{filename}}
+    &value={{content}}
+```
+
+For example:
+
+```txt
+GET https://git.example.com/johndoe/bliss/_new/articles/
+    ?filename=hello-world.md
+    &value=Hello%2C%20World!
+```